Arduino to ESP8266 Data With Serial Communication Using Arduino IDE (Mac OSX and Windows)

[@madspoulsen4243]

The startup WIFI status output to Serial, generates a invalid response which causes the whole communication to be out of sync. I'm getting "delayed" values, meaning the if I request a web update, then I get the values from the update before. I solved it by emptying the serial buffer at the end, ensuring that nothing is left. Insert a Serial.readString(); just after server.send

[@datasith]

Great tip, Poul. I'll pin your message for those following the code!

[@JuanCarlosGarfiasTovar]

This was the tutorial that saved my life, thank you so much. The explanation and steps were great!

[@Leo-vy6fz]

hey can we do this using esp32 instead of esp8266what are code differences

[@TheGood59]

Since that esp 8266 uses 3.3v in their ports and Arduino uses 5 V, isn't possible to damange the esp ?

[@danielman3531]

I have a problem when opening the webserver with the IP adress. It takes a few minutes to show the sensor data on the page. What could be the issue?

[@madspoulsen4243]

If you're tired of waiting "forever" for the response, speed up things a lot by adding: Serial.setTimeout(20); in your Setup method, on both the Arduino and the ESP. It will be lightning fast, but perhaps you need to adjust the timeout value. Also running 115200 on the serial port speed is great. Thanks for the video by the way, ACROBOTIC. You saved me a lot of time with this simple setup!

[@datasith]

Heya, Poul. Thanks for watching, I'm glad you found the code useful!

[@CuongBui-se8yb]

i got error when i upload code to esp8266, it say: esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header , how can i fix this

[@simonlukas1566]

Does this also work if i only have one usb port on my Laptop? What can I do if the esp8266 registered in my network but the local webpage does not Show anything while loading ifinitly?

[@mb-3faze]

I have to disconnect the rx and tx wires each time I upload to either the ESP or the UNO. Otherwise I get a timeout on the upload.

[@sibujacob977]

Hi, I like the clarity of the speech....!!

[@kunalsanghvi4280]

Your video actually helped a-lot, thankyou for making a wonderful and instructional video.

[@thennz29]

can i assign tx,rx pin to other pin in arduino bcoz im already using that tx,rx for other purpose.

[@donvukovic]

At about 2:12 you mention opening a second Arduino IDE instance. How do you do that in Windows 7 ?

[@datasith]

Sorry I don't have a Windows computer at the moment to try it out :(

[@JuuMtz]

I inserted the path . For example: “C:\Program Files (x86)\Arduino\arduino.exe”

[@deepakdgreat]

Serial.print puts data to serial port and it's a loop then between Arduino and ESP8266. Is there any workaround or just not use Serial.print at all for debug statements ?

[@neilvermeulen1407]

Nice! Well done. Quick and easy.

[@datasith]

Thanks so much, Neil! After a few years of practice, I might be getting the hang of it :)

[@w35l3y]

03:55 What if there are more serial data available? The current loop will overwrite the message and only keep the latest message. Is that expected? Thanks.

[@datasith]

notice that the while() loop is blocking, so as long as the connection doesn't close, the data will be read. thanks for watching the video!

[@w35l3y]

@@datasith Yes, it will keep overwriting the message because it is using "=" and not "+=" So the second iteration will overwrite the message stored on the first iteration.

[@jelkabisa]

Hello, Please I really need your help, I want to finalize a project but I'm stuck with sending information from one board to another, could you please help? maybe something is wrong with my code.

[@josemanuelbarajasramirez1821]

How could I do the same process but instead Arduino to ESP8266, ESP8266 to Arduino?

[@neerajgupta7013]

what changes do I need to make in the code if I don't want the request part in the program?

[@ayushmishra1975]

How many sensor data can be send through DynamicJson

[@liranbar1156]

And how do I send data from the ESP8266 to the Arduino?

[@datasith]

Exactly the same way, you can switch the read and write, and you'll send data the other way. HTH!

[@Imancu07]

Excellent video! keep up the good work!

[@datasith]

thanks so much, i'm glad you found it useful!

[@paulgibby6932]

Thanks! Another great video and project. All the best

[@datasith]

Thanks so much Paul. I'm glad you liked it!

[@miladk.2064]

I'm having issues getting this to work on my Arduino Nano, ESP-01, and OLED screen. When I run the code with the OLED commented out, the web server loads no problem. However once I uncomment the code for the OLED, the web server does not load up. Also, the OLED may or may not turn on. Any idea what could be going on?

[@datasith]

Make sure you're not writing locking code in your loop function. The server.handleClient() function needs to run relatively fast for the web server to work properly. HTH!

[@miladk.2064]

@@datasith Thanks for your reply. It seems like the issue was with the Arduino Nano not having enough RAM. We ordered the Arduino Every and everything is working fine now.

[@مريم-مناف-عدنان]

Thank you Please I have question Can we use software serial to send data like time and RFID card uid instead of arduinojeson

[@datasith]

Yes you can. You can even use ArduinoJson and SoftwareSerial together. ArduinoJson just gives us an easy way to format the data.

[@مريم-مناف-عدنان]

@@datasith thank you for answering my question .can you please tell me how can i send RFID card UID from Arduino to NodeMcu ,i need to know it as soon as possible for my graduation project . if you can't . could you please give me some link for tutorial.

[@tevintemu105]

Great video , it helped me alot !!

[@datasith]

I'm glad to hear it helped you, thanks for watching!

[@MarianCimpean]

Hello. I have one question. I want to make a communication between an arduino uno/mega and nodemcu with esp8266 module with i2c.I saw this tutorial and i want to ask you : can I power up the nodemcu from the arduino? I mean to make a connection between 3.3v arduino's pin and Vin pin from nodemcu.

[@datasith]

heya, yes you can, but read in full to know a risk! 1) depending on the NodeMCU board you have, you'll probably need the 5V pin on the Arduino to go into the Vin pin of the NodeMCU. Yes, the ESP8266 is a 3V3 chip, but the NodeMCU board *typically* has a voltage regulator at Vin. 2) where the voltage difference is important is on the SDA and SCL lines. they will be 5V because that's the operating voltage of the Arduino. in theory, the ESP8266 isn't 5V tolerant so you should use a level shifter (e.g., 74LVC245) to convert the 5V down to 3V3. but, in practice, communication works without the level shifter. it's up to you if you want to take the small risk. hth!

[@MarianCimpean]

@@datasith Thank you very much. I also own a level shifter but I wasn't pretty sure if I realy need it.

[@MarianCimpean]

@@datasith and also the board is NODEMCU v3 LoLin

[@S0K0N0MI]

What could be the reason for the ESP8266 page being loaded excruciatingly slow? And with slow I mean it takes a full minute for it to cough up 3 values. :(

[@shorts-zh9su]

did u find a fix??

[@riemanndiy6693]

Can I ask you if you are using the NodeMCU with Lua or AT commands? Because I followed every step of this video and it is not working for me. Could it be because you are using AT commands? Thanks

[@datasith]

when you flash firmware to the NodeMCU, it wipes out what was previously there. you need a specific firmware to run either Lua or AT commands. so, in my case i'm running custom firmware. where exactly are you getting stuck?

[@riemanndiy6693]

@@datasith Well I have tried and now it works! LOL. The only thing that miss and would be awesome, is to add to the web server an autorefresh every x second. How can I do this? Thank You so much,you do a great job!!

[@cadmarins]

@@datasith basically the custom program runs away from the AT commands right? Here AT commands do not respect timeout, it asks for connection, the host does not respond, then it happens that the Arduino program crashes. Terrible. I just want the arduino to send the variables to the esp, and the ESP8266 to handle all the connection request part, if the connection drops, reconnect and so on, in addition to the benefit of freeing a good part of the arduino's RAM. So your video shape solves these problems?

[@calvin-7540]

“ Distance & gas is not declared in this scope “ What can I do? These two variables are written after “double”. I copied the code and it didn't work

[@datasith]

double-check your code. you can check out the original sourced following the link in the description, thanks for watching!

[@tapsonkadakure9158]

Great video and its easy to understand, however i ran the code on mega, the url/web request trigures the function handleIndex and data is sent to mega but the esp cannot deserialise the response it says "{"type":"request"}DeserializationJson() failed: IncompleteInput"

[@datasith]

Thanks, I'm glad you liked it. It seems you're getting a bad response from the server. Print it out to the Serial Monitor before trying to deserialize to find out what's wrong. HTH!

[@abujarad60]

the esp8266 is 3.3v not 5v regulated, connecting the tx of the arduino to rx of the 8266 will burn it right?

[@datasith]

You're right that in principle these operate at two different voltages. The documentation on the ESP8266 indicates that the pins are not 5V-tolerant. However, some online discussions suggest that the pins are indeed 5V-tolerant, so out of laziness I'm going with that :) In my many experiments with it, I've never burned one, but if you wanted to be safe use a level-shifter. Thanks!

[@sangarmutusamy9801]

Hi, how to send more sensor data (say about 10 data)?

[@ayushmishra1975]

Have you done that yet, i f yes please send me some information?

[@yaomercader3079]

im getting error in my handleIndex why?

[@sinchanagupta]

Thank you for the wonderful video. I finally understood serial communication. Is there any way, I can include port number in the server? Because I'm using this code along with Node.js to create an express server.

[@jktipan87]

Excelente mi estimado saludos desde Ecuador, una consulta en el Node MCU esp8266 como envío los datos hacia thingspeak ya qué te permite generar gráficas

[@TresnaWidiyaman]

Its work ! Other time i try to modify this program, and remove webserver view to be display json data on serial monitor. I save the json program in void loop, but i have a error in my program. Nodemcu can't read the json data from arduino. Can you help me ?

[@datasith]

Hi, Tresna. I'm glad you're giving the code a try! Unfortunately with almost 20,000 subscribers I can't help everyone individually. If you tell me what sort of errors you're getting I might be able to point you in the right direction. Thanks for watching!

[@NirzanAkmal]

Hi. Is there any other way to parse the input without typing in the input of the serial monitor?

[@datasith]

Hi! At first, I use to simulate the data sent from one board to the other. But then, I let the two boards communicate between themselves and I only use the Serial Monitor to monitor the communication, so no typing is involved. Thanks for watching!

[@michaelgyimah7646]

this video was off great help but instead of sending it to a website can you help be sen it into a database

[@helenapoljak3353]

I'm getting an InvalidInput error. Do you know what the problem might be? Thanks

[@datasith]

heya helena, it must by a typo on the data that is being sent. if you send me the code i can have a quick look!

[@helenapoljak3353]

@@datasith I found a solution. Thanks :)

[@viktor7425]

@@helenapoljak3353 what was the solution?

[@S0K0N0MI]

Very cool, and very close to what I want to do. Is there a way you can add buttons to the website so you can interact with your arduino? For example I would like to turn on a light with my phone, can you do it with this?

[@oromis995]

look up home assistant

[@diegomartino]

HI..!! thank for your video.. your channel its great..!! I tested your code and works but when I send requests quickly the deserialization fail and return noMemory and remain blocked. I tested increasing the size of memory from (1024 to 2048) but when I do this its fail directly Im using an arduino Uno and a nodemcu. Its posible solve this problem or I need to use anothe approach to send a request multiples parameters quickly?!

[@diegomartino]

I solved the problem... this was the memory I asign to doc.. 1024 its a lot.. with 256 works. now the problem its the delay of reaction that its arround one second.

[@TechnoAutomation]

Your tutorials helped me a lot. Thanks for making such a wonderful video. I am doing project in which I interface Esp12F with Arduino promini. I planned to use ASCII code base technique. Like. Send character 'Q' for query. & Response Star with 'R' followed by data.. After watching your video I changed my plane & will try JSON as you have shown. My question is what benefits I get if used JSON formated data??

[@datasith]

I'm glad the info in my vids is useful! The main benefit in this case is being able to address your variables by key, for example data["temperature"]. It makes the code more readable and organized. The main benefit overall is that it makes 'chunks of data' easy to parse.

[@TechnoAutomation]

@@datasith thanks. In my method I have to do lots of character checking in code & chance of error is high. So if I use JSON format then codeing time also reduce. Thanks for your reply.

[@tomscietvirs2379]

Hello will this manual also apply to ESP 12-E?

[@datasith]

hi! yes, it will apply to any ESPx chip, even the ESP32 with some minor changes. hth!

[@med6402]

i've been waiting for this but how to make the web page refrech automatically every a time chosen variable for example every 5s

[@datasith]

I have other videos showing you how to use websockets and AJAX. You'll need to combine that approach with the one showed in this video.

[@med6402]

@@datasith thank you so much

[@eduardoesposito8013]

muy buen video!!!, pero lo mejor es la camiseta argetina!!!

[@LeoL123]

I hope that you could save the data into a file and store it in spiffs. So the data file can be managed later.

[@datasith]

i have other videos on storing data in SPIFFS (ssid and password). maybe you can re-use the code from there?

[@LeoL123]

@@datasith I have watched your video, It is quite straight forward. However, I want to store dynamic data which stored every single minute into spiffs from serial or the other GPIO pins. Managing the files like delete, rename etc, therefore I can utilize 3mb of spiffs instead of using microsd module.

[@datasith]

@@LeoL123, storing the data should also be 'straight forward' using my OTA code. Instead of storing the SSID and password in the setup function, you should move the code that writes to the File System to wherever you're trying to store the data.

[@Latigo1969]

Muy didáctico, excelente!!!.

[@datasith]

Gracias Cristian, me alegra que te haya gustado!

[@sanaullahkayani6481]

Sketch uses 294304 bytes (28%) of program storage space. Maximum is 1044464 bytes. Global variables use 27672 bytes (33%) of dynamic memory, leaving 54248 bytes for local variables. Maximum is 81920 bytes. esptool.py v2.8 Serial port COM6 Connecting........_____....._____....._____....._____....._____....._____.....____Traceback (most recent call last): File "C:\Users\sunny\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.3/tools/upload.py", line 65, in esptool.main(cmdline) File "C:/Users/sunny/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/esptool\esptool.py", line 2890, in main esp.connect(args.before) File "C:/Users/sunny/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.6.3/tools/esptool\esptool.py", line 483, in connect raise FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error)) esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header _ Sir, the Following error occur while uploading esp_firmware. Please help me how can i resolve it. Thanks

[@datasith]

Seems like you're having USB communication problems. This could be due to a bad USB driver, or not selecting the correct port for the ESP8266 board. HTH!

[@helaliwail6572]

can you please provide the sketch used in the video thank you

[@datasith]

Did you check the video description? 🙄

[@helaliwail6572]

@@datasith sorry to bother you but i don't see any link in the video description for the sketch used in this video. Thank you

[@helaliwail6572]

@@datasith sorry i found it thank you. I want to know if is it possible to have some tutorials about tbe nextion HMI screen for arduino. Thank you

[@LogicMathh]

Thank you.

[@zee-lab-electronics]

Great job

[@datasith]

Thanks so much!

[@HamzaHajeir]

Nice and Neat! and,, Vamos Argentina

[@datasith]

Thanks! and VAMOOOOO'!!

[@GersonRicha]

Pretty t-shirt! i have one... hehehehehe

[@datasith]

VAMO' ARGENTINA CARAJOOOOO!!! (lol)

[@GersonRicha]

ACROBOTIC 😂😂😂 but i am Brazilian...

[@datasith]

@@GersonRicha I imagined being named "Gerson" :) If we face each other in semis and you win (likely) I'm banning you from the channel! (j/k)

[@MPED05]

It would be great if you would upload the code too.

[@pushparajbhatta]

Hi , Thank you very much for this. It is really helpful. I am getting the following error: ets Jan 8 2013,rst cause:4, boot mode:(3,6) wdt reset load 0x4010f000, len 1384, room 16 tail 8 chksum 0x2d csum 0x2d v8b899c12 ~ld ______________________________________________ The rst cause:4 means watchdog reset which is caused due to the while loop in esp code, I tried using delay, yield, and also ESP.wdtDisable(); but I am getting same error. I am creating server as AsyncWebServer server(80); I have also posted the issue here: github.com/esp8266/Arduino/issues/7344

[@datasith]

Hey, Pushpa. Thanks for watching the vid, I'm glad it was helpful. The error is a standard reset as you point out. You can't do too many things in the loop when you're running a server, so you'll need to find a way to execute your tasks differently. You've already tried the easy-fix solutions, so you'll need to attempt to modify your code. HTH!